Perhaps you have had this experience: happily dressed in their own water-proof function charged clothing to walk in the rain, walking but feel more and more wrong ... My clothes are obviously waterproof, how or wet it?
In fact, "water prevention" and "waterproof" are two different things, what is the difference between the two?
Water protection
Anti-splashing water, also known as water drawing, is Epellent, abbreviated as W/R. Anti-splashing refers to the deposition of hydrophobic compounds on the surface of the fiber. The surface of the fabric has pores. Air and water vapor can also pass through. Generally, water droplets(like Lotus leaves) are formed on the surface of the cloth. It is not really waterproof, but It reduces the absorption of water by the fabric. The water can be "pulled away" on the surface of the fabric, and the water will seep into it after a long stay.
Anti-splashing processing uses various chemical materials to attach a layer of ultra-fine "needle beds" to the surface of the fabric, making the surface tension of the fabric less than the cohesion of the water. Therefore, after the drop of water falls, the water droplets will roll away instead of spreading. wet. If this "needle bed" structure is flattened or infiltrated by oil cover, the fabric's water-proof ability will be greatly reduced and even begin to absorb water. The water-proof effect of the fabric will gradually weaken or even fail with washing and long-term use.
Therefore, when you go out on a rainy day wearing a water-proof dress, you can quickly shake off the water droplets on the surface of the clothes, but whether the clothes inside will be wet depends on the size of the rain and the time spent in the rain. The anti-splash water is not really completely waterproof.
waterproof
The waterproof English is water resign/water process, which refers to waterproof and moisture-permeable fabrics. It usually refers to making a glue bottom on the bottom of the fabric, divided into two types: coating and lamination. Coating is often referred to as coating. lamination refers to lamination, which is a composite layer of waterproof material. Most waterproof fabrics use laminated(thin film) materials, as well as capsule fibers, compact fabrics, silicification and other forms of treatment, and are usually located in the inner layer of the fabric, which is often referred to as "waterproof film."
Water-proof film is a kind of composite fabric that combines thin film with other materials through the paste process. The fabric itself is not waterproof, so when we wear waterproof clothing in wet weather, we will see water seeping into the clothing, just like ordinary fabrics. Clothing, However, the inner layer of the garment is dry, which is the waterproof film in the middle of the composite fabric plays a role.
Water-proof ability is expressed in terms of water-resistant pressure, that is, a fixed area of waterproof cloth blocks the continuously rising water pressure. When the surface seeps out the third drop of water, it is the water-resistant pressure value of the fabric, which usually exceeds 1000 mmH2O. Can achieve the most basic water resistance.
Functional distinction between the two
1, waterproof products than anti-splashing water products can be more durable waterproof, physical and chemical properties of more stable;
2, waterproof products usually do not fail due to washing and long-term use;
3, waterproof products have higher water pressure resistance than water-resistant products, usually at least 3000 mmH2O or more;
4, in the specific application of clothing, the main role of water-proof treatment is to reduce the absorption of water by the fabric, so that the water can be "pulled off" on the surface of the fabric; Waterproofing is a barrier that is completely impervious to water, regardless of whether the fabric absorbs water or not.